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Author Topic: Blower motor blows fuse  (Read 11509 times)

Offline Joe dinubilo

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Blower motor blows fuse
« on: September 18, 2014, 10:42:13 PM »
I'm working on my sons 1982 chevy 4x4 truck that he just purchased. The blower motor works fine until you switch it to heat then it blows the fuse. Any ideas on where to start troubleshooting this issue.
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Offline bake74

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Re: Blower motor blows fuse
« Reply #1 on: September 22, 2014, 08:43:53 AM »
     I know that year of truck is different than what I am used to (73-80) models.  I think I remember the switching mechanism might have some electronics to it.
     On mine a cable moves the door, so something has to causing a short for you to blow the fuse when you switch to heater.  I am sure others will chime in today.
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Offline Captkaos

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Re: Blower motor blows fuse
« Reply #2 on: October 09, 2014, 10:10:32 PM »
Did you figure this out?
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Offline Joe dinubilo

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Re: Blower motor blows fuse
« Reply #3 on: October 13, 2014, 05:42:34 PM »
Still have not located problem with blowing fuse. Its a 1982 Chevy Truck if I set the selector switch to vent and turn on the blower switch everything works fine,as soon as I move the selector switch to heat,a/c or defrost it blows the fuse. I did replace the resistor and the selector switch and it still blows the fuse. I have hooked up the blower motor directly to the battery with a 20amp in line fuse, it ran 5 minutes and never blew the in line fuse. Anyone have any ideas where else to look or what else to check. Any input would be greatly appreciated.
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Offline VileZambonie

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Re: Blower motor blows fuse
« Reply #4 on: October 13, 2014, 05:52:58 PM »
So clarify, is it the mode change that causes the circuit to open or the temperature selection from hot to cold? Which switch did you replace? The fan speed switch or the mode switch?
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Offline Joe dinubilo

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Re: Blower motor blows fuse
« Reply #5 on: October 13, 2014, 07:36:01 PM »
its the mode switch, will not blow fuse in vent mode
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Offline Joe dinubilo

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Re: Blower motor blows fuse
« Reply #6 on: October 13, 2014, 07:38:43 PM »
Sorry I did replace the mode switch
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Offline roundhouse

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Re: Blower motor blows fuse
« Reply #7 on: October 14, 2014, 06:28:51 AM »
Mine blows the fuse to the TBI computer when I turn the blower on high .

No clue how it's back feeding power or whatever
But I'm gonna have to run the Computer power streigt to the battery I guess
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Offline VileZambonie

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Re: Blower motor blows fuse
« Reply #8 on: October 15, 2014, 06:03:19 PM »
Roundhouse - thread hijack unrelated problem you should start a thread on when you are ready to tackle problem.

Joe, is the truck AC equipped? What modes cause the fuse to blow?
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Offline Joe dinubilo

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Re: Blower motor blows fuse
« Reply #9 on: October 15, 2014, 06:37:27 PM »
Yes the truck is a/c equip. here's a little more info I just figured out. If I set the mode switch to vent before I turn on the ignition everything works fine AND I can switch to heat but if I switch one more click to defrost or back the other way to the A/c settings it blows the fuse. When it does work all speeds on the blower motor work.
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Offline VileZambonie

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Re: Blower motor blows fuse
« Reply #10 on: October 16, 2014, 06:21:50 PM »
Is your AC hooked up and functioning prior to this issue?
Unplug the connector at the AC compressor and see if it still happens.
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Offline 78BIG-TEN

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Re: Blower motor blows fuse
« Reply #11 on: October 16, 2014, 07:23:08 PM »
also if it has a throttle solenoid best check that too
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Offline Joe dinubilo

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Re: Blower motor blows fuse
« Reply #12 on: October 16, 2014, 11:37:27 PM »
A/C is installed in the truck not sure if its functioning properly. Compressor is disconnected. My son acquired this truck a couple months ago. Never knew if A/c worked although all components are there and hookd up. Cannot test a/c because of fuse issue.
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Offline Joe dinubilo

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Re: Blower motor blows fuse
« Reply #13 on: October 17, 2014, 05:39:58 PM »
Disconnected throttle solenoid and fuse is now holding. Thanks to all you guys for help on this issue very much appreciated.
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Offline 78BIG-TEN

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Re: Blower motor blows fuse
« Reply #14 on: October 18, 2014, 11:40:49 AM »
Glad you got it worked out Joe
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